Aric Cyr wrote:
After finally getting fed up with not having my activity light working
for my SATA drives, I came up with a small patch (more like hack) to
make it work. It works quite well, but I'm afraid that there are many
restriction that this patch does not check for that it probably
should... so consider this a work-in-progress. My information is
based on a document from Silicon Image that appears to no longer be
available on their website (Sil-AN-0082-E; 8112-0082.pdf). I still
have a copy if anyone is interested.
There are two restrictions that are not checked:
1) Is the chip a 3112 or 3114? I assume that this would only work on
a 3112, but whether it is "a bad thing" on a 3114 I do not know.
2) BAR5 + 0x54 is apparently used for the flash memory address and
data lines. However for most motherboards (i.e. not add-on cards)
with the chip, like my EPOX 8RDA3+, there is no flash memory, so
these lines are hijacked as LED GPIO. I assume that this is a
common practice for motherboard makers using the sil3112 since
Silicon Image went out of their way to produce the above mentioned
document. Anyways, the problem is that this patch does not check
if flash memory is installed or not before twiddling with the GPIO
lines. This could be extremely bad for people running the 3112
from add-on cards (or any implementation with flash memory
installed).
Setting the low 8bits at BAR5+54h seems to enable the LED circuit. It
seems that this circuit is patched through into the motherboard as it
lights the regular hard drive light on the front of my case. Setting
bits [8:15] at BAR5+54h clears the bits, disabling the LED. I hooked
this logic into the ata_bmdma_start and ata_bmdma_stop which were made
into simple wrapper functions in sata_sil.c that just set the GPIO
bits and calls ata_bmdma_*.
I don't think its ugly, necessarily. I do worry about the flash memory
stuff, though, which is why I don't want to merge this upstream for now.
For your patch specifically, it would be nice to follow the coding style
that is found in the rest of the driver (single-tab indents, etc., read
CodingStyle in kernel source tree).
Jeff
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